mirror of
https://github.com/zeldaret/oot.git
synced 2024-11-11 03:39:59 +00:00
Decompiles Overlay_DoRelocation (#149)
* decompile Overlay_DoRelocation * add non-matching comments
This commit is contained in:
parent
43dfaa7518
commit
9a478a96ec
2 changed files with 129 additions and 3 deletions
|
@ -1,3 +1,129 @@
|
|||
#include <global.h>
|
||||
|
||||
#ifdef NON_MATCHING
|
||||
void Overlay_DoRelocation(void* allocatedVRamAddress, OverlayRelocationSection* overlayInfo, void* vRamAddress) {
|
||||
// mostly regalloc, more specific issues described below.
|
||||
u32 sections[4];
|
||||
u32 unrelocatedAddress;
|
||||
u32 dbg;
|
||||
u32 relocatedValue;
|
||||
u32 relocOffset;
|
||||
u32 relocatedAddress;
|
||||
u32 i;
|
||||
u32* relocDataP;
|
||||
u32* luiRefs[32];
|
||||
u32 luiVals[32];
|
||||
u32 relocData;
|
||||
u32 reloc;
|
||||
u32 vaddr;
|
||||
u32* luiInstRef;
|
||||
u32 addrToLoad;
|
||||
u32 luiInst;
|
||||
u32* regValP;
|
||||
u32 isLoNeg;
|
||||
|
||||
relocOffset = 0;
|
||||
relocatedValue = 0;
|
||||
unrelocatedAddress = 0;
|
||||
relocatedAddress = 0;
|
||||
|
||||
if (gOverlayLogSeverity >= 3) {
|
||||
osSyncPrintf("DoRelocation(%08x, %08x, %08x)\n", allocatedVRamAddress, overlayInfo, vRamAddress);
|
||||
osSyncPrintf("text=%08x, data=%08x, rodata=%08x, bss=%08x\n", overlayInfo->textSize, overlayInfo->dataSize,
|
||||
overlayInfo->rodataSize, overlayInfo->bssSize);
|
||||
}
|
||||
|
||||
sections[0] = 0;
|
||||
sections[1] = (u32)allocatedVRamAddress;
|
||||
sections[2] = sections[1] + overlayInfo->textSize;
|
||||
sections[3] = sections[2] + overlayInfo->dataSize;
|
||||
|
||||
for (i = 0; i < overlayInfo->nRelocations; i++) {
|
||||
reloc = overlayInfo->relocations[i];
|
||||
relocDataP = (u32*)(sections[reloc >> 0x1E] + (reloc & 0xFFFFFF));
|
||||
relocData = *relocDataP;
|
||||
switch (reloc & 0x3F000000) {
|
||||
case 0x2000000:
|
||||
/* R_MIPS_32
|
||||
* handles 32-bit address relocation. Used in things such as
|
||||
* jump tables.
|
||||
*/
|
||||
if ((*relocDataP & 0xF000000) == 0) {
|
||||
relocOffset = *relocDataP - (u32)vRamAddress;
|
||||
relocatedAddress = relocOffset + (u32)allocatedVRamAddress;
|
||||
relocatedValue = relocatedAddress;
|
||||
unrelocatedAddress = relocData;
|
||||
*relocDataP = relocatedAddress;
|
||||
}
|
||||
break;
|
||||
case 0x4000000:
|
||||
/* R_MIPS_26
|
||||
* handles 26-bit address relocation, used for jumps and jals
|
||||
*/
|
||||
unrelocatedAddress = ((*relocDataP & 0x3FFFFFF) << 2) | 0x80000000;
|
||||
relocOffset = unrelocatedAddress - (u32)vRamAddress;
|
||||
relocatedValue =
|
||||
(*relocDataP & 0xFC000000) | ((((u32)allocatedVRamAddress + relocOffset) & 0xFFFFFFF) >> 2);
|
||||
relocatedAddress = ((relocatedValue & 0x3FFFFFF) << 4) | 0x80000000;
|
||||
*relocDataP = relocatedValue;
|
||||
break;
|
||||
case 0x5000000:
|
||||
/* R_MIPS_HI16
|
||||
* Handles relocation for a lui instruciton, we just store the reference to
|
||||
* the instruction, and will update it in the R_MIPS_LO16 section.
|
||||
*/
|
||||
luiRefs[(*relocDataP >> 0x10) & 0x1F] = relocDataP;
|
||||
luiVals[(*relocDataP >> 0x10) & 0x1F] = *relocDataP;
|
||||
break;
|
||||
case 0x6000000:
|
||||
/* R_MIPS_LO16
|
||||
* here we will update the LUI instruction to reflect the relocated address.
|
||||
* The full address is calculated from the LUI and lo parts, and then updated.
|
||||
* if the lo part is negative, we make sure to add 1 to the lui.
|
||||
*/
|
||||
regValP = &luiVals[((*relocDataP >> 0x15) & 0x1F)];
|
||||
vaddr = (*regValP << 0x10) + (s16)*relocDataP;
|
||||
luiInstRef = luiRefs[((*relocDataP >> 0x15) & 0x1F)];
|
||||
if ((vaddr & 0xF000000) == 0) {
|
||||
relocOffset = vaddr - (u32)vRamAddress;
|
||||
addrToLoad = relocOffset + (u32)allocatedVRamAddress;
|
||||
isLoNeg = ((addrToLoad & 0x8000) ? 1 : 0);
|
||||
luiInst = *luiInstRef;
|
||||
*luiInstRef = (luiInst & 0xFFFF0000) | (((addrToLoad >> 0x10) & 0xFFFF) + isLoNeg);
|
||||
unrelocatedAddress = (luiInst << 0x10) + (((s16)relocData) & (0xFFFFFFFFFFFFFFFFu));
|
||||
relocatedValue = (*relocDataP & 0xFFFF0000) | (addrToLoad & 0xFFFF);
|
||||
|
||||
// The conversion of relocatedAddress to s16 is wrapped around the OR operation of
|
||||
// relocated value
|
||||
relocatedAddress = (*luiInstRef << 0x10) + (s16)relocatedValue;
|
||||
*relocDataP = relocatedValue;
|
||||
}
|
||||
break;
|
||||
}
|
||||
|
||||
if (1) {
|
||||
dbg = 0x10;
|
||||
switch (reloc & 0x3F000000) {
|
||||
case 0x2000000:
|
||||
dbg = 0x16;
|
||||
case 0x4000000:
|
||||
dbg += 0xA;
|
||||
case 0x6000000:
|
||||
if (gOverlayLogSeverity >= 3) {
|
||||
osSyncPrintf("%02d %08x %08x %08x ", dbg, relocDataP, relocatedValue, relocatedAddress);
|
||||
osSyncPrintf(" %08x %08x %08x %08x\n",
|
||||
((u32)relocDataP + (u32)vRamAddress) - (u32)allocatedVRamAddress, relocData,
|
||||
unrelocatedAddress, relocOffset);
|
||||
}
|
||||
break;
|
||||
default:
|
||||
continue;
|
||||
}
|
||||
}
|
||||
// The loop seems to be incremented, then checked, but the conditional is a likely vs non, so it could
|
||||
// potentially resolve itself.
|
||||
}
|
||||
}
|
||||
#else
|
||||
#pragma GLOBAL_ASM("asm/non_matchings/code/relocation/Overlay_DoRelocation.s")
|
||||
#endif
|
||||
|
|
|
@ -208,7 +208,7 @@ void func_809ECA50(EnDha* this, GlobalContext* globalCtx) {
|
|||
}
|
||||
} else {
|
||||
unkVar = ~0x80;
|
||||
if (player->stateFlags2 & 0x80) {
|
||||
if (player->stateFlags2 & 0x80) {
|
||||
if (&this->actor == player->actor.attachedA) {
|
||||
player->stateFlags2 &= unkVar;
|
||||
player->actor.attachedA = NULL;
|
||||
|
@ -230,7 +230,7 @@ void func_809ECF60(EnDha* this) {
|
|||
void func_809ECF8C(EnDha* this, GlobalContext* globalCtx) {
|
||||
Player* player = PLAYER;
|
||||
|
||||
if (player->stateFlags2 & 0x80) {
|
||||
if (player->stateFlags2 & 0x80) {
|
||||
if (&this->actor == player->actor.attachedA) {
|
||||
player->stateFlags2 &= ~0x80;
|
||||
player->actor.attachedA = NULL;
|
||||
|
@ -267,7 +267,7 @@ void EnDha_Die(EnDha* this, GlobalContext* globalCtx) {
|
|||
Vec3f vector;
|
||||
Player* player = PLAYER;
|
||||
|
||||
if (player->stateFlags2 & 0x80) {
|
||||
if (player->stateFlags2 & 0x80) {
|
||||
if (&this->actor == player->actor.attachedA) {
|
||||
player->stateFlags2 &= ~0x80;
|
||||
player->actor.attachedA = NULL;
|
||||
|
|
Loading…
Reference in a new issue